Drilling and tapping fixture



May 20, 1941, PANZER 2,242,792

DRILLING AND TAPPING FIXTURE Filed June 12, 1939 Patented May 20, 1941UNITED STATES PATENT oFF cE s I panama affirm y Karl Panzer, Chicago,Ill.

Application June 12, i989, Serial No. 278,613

4 Claims. (01. 71-62) This invention relates to improvements in afixture for accurately drilling and tapping work of various shapes, andis more particularly directed to a type of fixture which may be clampedto the work or to which the work may be secured.

One object of my invention is the provision of a fixture of thischaracter which is highly emcient in its use, and which is designed tobe self-contained, so that it may be easily and readily attached to thework, or to which the work may be secured.

Various kinds of fixtures for drilling and tapping have heretofore beenproposed. In many of such fixtures, the drilling and tapping isaccomplished by placing the. work directly beneath the fixture andclamping the same thereto. These fixtures are rather large and thebosses andcbstructions on different kinds of work make it impossible touse the fixture. Also the fixtures are movable. in a horizontal planefor drilling and tappin at a right-angle to the base on which the workis mounted.

My improved fixture is precision made and is for use by toolmakers,machinists, and various other types of mechanics, for work to be drilledand tapped, and is more especially for use for tapping which requiresaccuracy and the proper positioning of the holes in the material to betapped, while requiring a true and exact tapping of the hole drilled.The drilling and tapping may be accomplished at the proper place withone setting of the fixture. This is accomplished by setting the fixtureto the required angle or by setting the fixture to accommodate for thevarious kinds of work to be drilled and tapp d.

The fixture is arranged to be adjusted and is separable for use withdifferent kinds of work, and when assembled, is of very compact form, soas to be easily carried about in a toolmakers' qr machinists kit, to bereadily usable to any type of work for properly drilling and tappingholes therein, or for properly tapping holes which have been previouslydrilled.

Further, the device is provided with a pair of V-blocks, each carried onan arm and which arms are adjustable longitudinally so as to positionone V-block with respect to the other. One of the V-blocks serves as atool guide carrier and is arranged to pivotally swing and to be bodilyadjusted vertically on the upper arm, while the other of said V-blocksis secured to the lower arm and depends at a right angle therefrom taform a square therewith and this V-block also carrier desired angle andthe fixture is then clamped serves to guide work, such as round stock,in

alignment with the tool guide carrier.

underneath side thereof. when drilling and tapping in the end of flatstock, the tool guide pivotally swung on its arm to the to the work.

For aligning the fixture with holes previously drilled in stock, a plugis employed. This plug is furnished with the fixture and is of a size toslidably fit in a bored opening in the tool guide carrier. The plug isprovided with a tapered end so as to locate the drilled hole, and whenlocated, the fixture is clamped to the stock and the plug is removed.Then a tool guide is inserted in the bore to guide a tap'into thedrilled hole. The size of tool guide employed depends upon the size oftap used.

The tool guide carrier is also provided with an indicator that ismanually adjustable thereon for aligning round stock to be drilled andtapped after a line' has :been scribed longitudinally thereof.

Reference being had to the following figures of the drawing, in which:

Figure 1 1s a perspective view of drilling and tapping fixture.

Figure-2 is a detail longitudinal sectional view of the upper portion ofthe fixture and V-block forming a tool guide carrier, shown clamped to apiece of work to be drilled and tapped.

Figure 3 is a longitudinal sectional view of the fixture with the toolguide carrier adjusted for drilling and tapping horizontally of thework.

Figure 4 is a top plan view of the lower portion of the fixture.

Figure 5 is a detail end view of the V-block forming a tool guidecarrier and illustrating a clamp attached thereto for holding work to bedrilled and tapped.

my improved Figure 6 is a detail cross sectional view of a tool guidefor use in connection with the fixture; and

Figure 7 is a side'elevation of a centering plug sists of two relativelyfiat arms l0 and II, respectively, which are arranged in face to facesliding relation and secured together by means of wing bolts l2- -l2that extend through elongated slots l8-ll in the upper arm I. andarethreaded into threaded openings 14- in the lower arm ll, (Fig. 4).The upper arm II is provided with a pair of integral upwardly'extendingbifurcated portions l8l8 on each side and at one end thereof, betweenwhich a V-biock forming a tool guide carrier I8 is positioned, and whichV-block or tool guide carrier is adapted to be pivotally secured to thebifurcated portions of the arm by means of thumb screws |1l1. Thesescrews may be selectively threaded into any of the pairs of alignedthreaded openings l8-i8 provided on each side of the V-block or toolguide carrier l6. Parallel with and above and below these openings l8l8,the V-block I8 is provided with grooves arranged in pairs 2ll2l and22-23, which are adapted to receive the ends 24-25 of a U-shaped clamp28 which is slidably positioned therein for holding the work, (Fig. 5).The V-block or tool guide carrier i8 is also provided with a relativelylarge bore 21, which is arranged to receive a tool guide 28 therein, andwhich tool guides are each provided with a bore 28 therein, the boresbeing of sizes corresponding to the drill sizes and the tap sizesdesired for the work.

At one end of the V-block or tool guide carrier l8 and centrallythereof, is a parallel milled groove 28 in which an indicator II isslidably positioned, and which indicator is provided with an elongatedslot 82 through .which a thumb screw 88 extends and is threaded in theV-block. The

lower portion of the indicator is formed outwardly providing a fingerpiece 84 for-adjusting the same in the groove 88, and when adjusted, maybe secured by the thumb screw 88. This indicator is especially for usein connection with round stock to be drilled and-tapped along a linescribed longitudinally thereof for indicating the proper alignment ofthe holes to be drilled and tapped, (Fig. 5), when the same is clampedto the V-block I8 by means of the clamp 26.

The lower arm'll of the fixture carries a V- block 26, which is providedwith a longitudinally extending groove 41 on each side thereof and whichgrooves also receive the ends 24-25 of the clamp 26 therein. The clampis slidably positioned in the grooves 28-31 of the V-block 85 forsecuring work below the upper arm l0 and to retain the work aligned withthe V-block or tool guide carrier l6 and'the tool guide 28 therein. Thisarm I I may then be adjusted with respect to the upper arm 18 byreleasing the wing bolts l2-i2 and sliding the arm ll longitudinallywith respect to the arm I0 until the work clamped to the V-block 85 isproperly positioned with respect to the tool guide in the tool guidecarrier l8; then the wing bolts l2--l2 are manually turned to secure thearms II and I0 together.

In order to insure the correct drilling and tapping of holes in work, atool guide 28 which is preferablythe size of the drill to be used, ispositioned in the bore 21 of the tool guide carrier ii to guide thedrill into the work, and when drilled, the tool guide 28 is removed anda tool guide of the tap size is then inserted in the bore 21 foraccurately guiding the tap into the drilled hole previously made byguiding the drill.

when a piece of fiat work is to be drilled and tapped, the lower arm iiis. removed from the upper arm 18 by removing the wing bolts l2-l2 andthe arm l8 may then be placed directly upon the work (Fig. 2), and thedrill and tap guided by a tool guide 28 in the same manner as that abovedescribed. In order to rigidly secure the fixture to the work, a

- discs, and in order to accomplish this, the tool guide carrier [8 maybe bodily swung on the thumb screws |1-l1 and adjusted vertically in thebifurcated portions l8-ll of arm 18 for the proper aligning andpositioning of the drill andtap. To further adjust the tool guidecarrier ii, any of the threaded openings ll-l8 may be employed whichpermits of additional adjustments of the tool guide carrier. Also, thework may be clamped by means of a 6-clamp B to the top surface of thearm In for securely retaining the fixture in position, (Fig. 3).

' The removable lower'arm I I of the fixture may also be employed as asquare by reason of the V- block 88 being fixedly attached to the arm ata 90 degree angle.

The standard types of taps of the present day construction range fromvery small to approximately one half inch, with a straight shank ofapproximately the same diameter as the threaded portion ofthe tap, butin the sizes exceeding one half inch, the shank of the tap is reducedand therefore, a slightly different type of tool guide 28a is employed,(Fig. 6). This tool guide is provided with a central bore 29a whichreceives the shank of .the tap and an enlarged bore 28b which I tappingthereof, and therefore, when the tap is well started, itwill be properlyaligned and the fixture may then be removed and the tap will beaccurately aligned to guide itself to complete the tapping operation.

- Assume now that the fixture is to be positioned on work which has beenpreviously drilled and is to be tapped, then prior to the securing ofthe fixture to the work; the tool guide 28 is removed from bore 21 ofthe tool guide carrier, (Fig. 7), and a plug 28 is employed. This plug28 snugly fits the bore 21 of the tool guide carrier l8 and is providedwith a conical end 8! to locate the drilled hole in the work, andwhenthe hole is located, the plug serves to center the bore 21 of thetool guide carrier with the drilled hole. Then the fixture is clamped tothe work and the centering plug 38 is removed and a tool guide 28 of thesize of the tap to be used, is inserted in the bore 21 for guiding thetap.

I claim: a

1. In a device of the character described, the combination of a pair ofarms arranged one over the other for longitudinal adjustments withrespect to each other, a member having a bore therein forming a toolguide carrier and pivoted for manual angular adjustments at one end ofone of said arms, a second member fixedly secured to one end of theother of said pair of arms forming a right angle therewith, atool guidein said tool guide carrier for directing a tool into work positionedagainst said second member and adjustably located by movement of one ofsaid arms with respect to the other. r

2. In a device of the character described, the combination of a pair ofarms arranged one over the other for longitudinal adjustments withrespect to each other, a tool guide carrier arranged for manual pivotaladjustments at one end of one of said arms, a tool guide in said toolguide carrier, a member secured to one end of the other of said pair ofarms and adapted to support and align work with respect to said toolguide carrier.

3. In a device of the character described, the combination of a pair ofarms arranged in overlapped relation and for longitudinal adjustmentswith respect to each other, a member carried'at one end of each of saidpair of arms, one of said members forming a tool guide carrier and beingarranged for pivotal adjustments with respect'tothe other member, andmeans for locking said pivoted tool guide carrier in adjusted positions.

4. In a device of the character described,- the combination 0! aseparable pair 01 arms arranged in overlapped relation for longitudinaladjustments with respect to each other, a tool guide carrier pivoted atone end of one of said pair of arms and being arranged for verticaladjustments thereon, a tool guide in said tool guide carrier, a membercarried by the other of said arms and movable therewith for adjustmentwith respect to the tool guide carrier, and means adjustably securingsaid arms together.

KARL PANZER.

